sound/soc/soc-pcm.c

   1 /*
   2  * soc-pcm.c  --  ALSA SoC PCM
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Copyright 2005 Openedhand Ltd.
   6  * Copyright (C) 2010 Slimlogic Ltd.
   7  * Copyright (C) 2010 Texas Instruments Inc.
   8  *
   9  * Authors: Liam Girdwood <lrg@ti.com>
  10  *          Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/export.h>
  27 #include <linux/debugfs.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/soc.h>
  32 #include <sound/soc-dpcm.h>
  33 #include <sound/initval.h>
  34
  35 #define DPCM_MAX_BE_USERS       8
  36
  37 /**
  38  * snd_soc_runtime_activate() - Increment active count for PCM runtime components
  39  * @rtd: ASoC PCM runtime that is activated
  40  * @stream: Direction of the PCM stream
  41  *
  42  * Increments the active count for all the DAIs and components attached to a PCM
  43  * runtime. Should typically be called when a stream is opened.
  44  *
  45  * Must be called with the rtd->pcm_mutex being held
  46  */
  47 void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
  48 {
  49         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  50         int i;
  51
  52         lockdep_assert_held(&rtd->pcm_mutex);
  53
  54         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  55                 cpu_dai->playback_active++;
  56                 for (i = 0; i < rtd->num_codecs; i++)
  57                         rtd->codec_dais[i]->playback_active++;
  58         } else {
  59                 cpu_dai->capture_active++;
  60                 for (i = 0; i < rtd->num_codecs; i++)
  61                         rtd->codec_dais[i]->capture_active++;
  62         }
  63
  64         cpu_dai->active++;
  65         cpu_dai->component->active++;
  66         for (i = 0; i < rtd->num_codecs; i++) {
  67                 rtd->codec_dais[i]->active++;
  68                 rtd->codec_dais[i]->component->active++;
  69         }
  70 }
  71
  72 /**
  73  * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
  74  * @rtd: ASoC PCM runtime that is deactivated
  75  * @stream: Direction of the PCM stream
  76  *
  77  * Decrements the active count for all the DAIs and components attached to a PCM
  78  * runtime. Should typically be called when a stream is closed.
  79  *
  80  * Must be called with the rtd->pcm_mutex being held
  81  */
  82 void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
  83 {
  84         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  85         int i;
  86
  87         lockdep_assert_held(&rtd->pcm_mutex);
  88
  89         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  90                 cpu_dai->playback_active--;
  91                 for (i = 0; i < rtd->num_codecs; i++)
  92                         rtd->codec_dais[i]->playback_active--;
  93         } else {
  94                 cpu_dai->capture_active--;
  95                 for (i = 0; i < rtd->num_codecs; i++)
  96                         rtd->codec_dais[i]->capture_active--;
  97         }
  98
  99         cpu_dai->active--;
 100         cpu_dai->component->active--;
 101         for (i = 0; i < rtd->num_codecs; i++) {
 102                 rtd->codec_dais[i]->component->active--;
 103                 rtd->codec_dais[i]->active--;
 104         }
 105 }
 106
 107 /**
 108  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 109  * @rtd: The ASoC PCM runtime that should be checked.
 110  *
 111  * This function checks whether the power down delay should be ignored for a
 112  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 113  * been configured to ignore the delay, or if none of the components benefits
 114  * from having the delay.
 115  */
 116 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 117 {
 118         int i;
 119         bool ignore = true;
 120
 121         if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
 122                 return true;
 123
 124         for (i = 0; i < rtd->num_codecs; i++)
 125                 ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;
 126
 127         return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
 128 }
 129
 130 /**
 131  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 132  * @substream: the pcm substream
 133  * @hw: the hardware parameters
 134  *
 135  * Sets the substream runtime hardware parameters.
 136  */
 137 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
 138         const struct snd_pcm_hardware *hw)
 139 {
 140         struct snd_pcm_runtime *runtime = substream->runtime;
 141         runtime->hw.info = hw->info;
 142         runtime->hw.formats = hw->formats;
 143         runtime->hw.period_bytes_min = hw->period_bytes_min;
 144         runtime->hw.period_bytes_max = hw->period_bytes_max;
 145         runtime->hw.periods_min = hw->periods_min;
 146         runtime->hw.periods_max = hw->periods_max;
 147         runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
 148         runtime->hw.fifo_size = hw->fifo_size;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 152
 153 /* DPCM stream event, send event to FE and all active BEs. */
 154 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 155         int event)
 156 {
 157         struct snd_soc_dpcm *dpcm;
 158
 159         list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
 160
 161                 struct snd_soc_pcm_runtime *be = dpcm->be;
 162
 163                 dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
 164                                 be->dai_link->name, event, dir);
 165
 166                 snd_soc_dapm_stream_event(be, dir, event);
 167         }
 168
 169         snd_soc_dapm_stream_event(fe, dir, event);
 170
 171         return 0;
 172 }
 173
 174 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 175                                         struct snd_soc_dai *soc_dai)
 176 {
 177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 178         int ret;
 179
 180         if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
 181                                 rtd->dai_link->symmetric_rates)) {
 182                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 183                                 soc_dai->rate);
 184
 185                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 186                                                 SNDRV_PCM_HW_PARAM_RATE,
 187                                                 soc_dai->rate, soc_dai->rate);
 188                 if (ret < 0) {
 189                         dev_err(soc_dai->dev,
 190                                 "ASoC: Unable to apply rate constraint: %d\n",
 191                                 ret);
 192                         return ret;
 193                 }
 194         }
 195
 196         if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
 197                                 rtd->dai_link->symmetric_channels)) {
 198                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 199                                 soc_dai->channels);
 200
 201                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 202                                                 SNDRV_PCM_HW_PARAM_CHANNELS,
 203                                                 soc_dai->channels,
 204                                                 soc_dai->channels);
 205                 if (ret < 0) {
 206                         dev_err(soc_dai->dev,
 207                                 "ASoC: Unable to apply channel symmetry constraint: %d\n",
 208                                 ret);
 209                         return ret;
 210                 }
 211         }
 212
 213         if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
 214                                 rtd->dai_link->symmetric_samplebits)) {
 215                 dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 216                                 soc_dai->sample_bits);
 217
 218                 ret = snd_pcm_hw_constraint_minmax(substream->runtime,
 219                                                 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 220                                                 soc_dai->sample_bits,
 221                                                 soc_dai->sample_bits);
 222                 if (ret < 0) {
 223                         dev_err(soc_dai->dev,
 224                                 "ASoC: Unable to apply sample bits symmetry constraint: %d\n",
 225                                 ret);
 226                         return ret;
 227                 }
 228         }
 229
 230         return 0;
 231 }
 232
 233 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
 234                                 struct snd_pcm_hw_params *params)
 235 {
 236         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 237         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 238         unsigned int rate, channels, sample_bits, symmetry, i;
 239
 240         rate = params_rate(params);
 241         channels = params_channels(params);
 242         sample_bits = snd_pcm_format_physical_width(params_format(params));
 243
 244         /* reject unmatched parameters when applying symmetry */
 245         symmetry = cpu_dai->driver->symmetric_rates ||
 246                 rtd->dai_link->symmetric_rates;
 247
 248         for (i = 0; i < rtd->num_codecs; i++)
 249                 symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;
 250
 251         if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
 252                 dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
 253                                 cpu_dai->rate, rate);
 254                 return -EINVAL;
 255         }
 256
 257         symmetry = cpu_dai->driver->symmetric_channels ||
 258                 rtd->dai_link->symmetric_channels;
 259
 260         for (i = 0; i < rtd->num_codecs; i++)
 261                 symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;
 262
 263         if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
 264                 dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
 265                                 cpu_dai->channels, channels);
 266                 return -EINVAL;
 267         }
 268
 269         symmetry = cpu_dai->driver->symmetric_samplebits ||
 270                 rtd->dai_link->symmetric_samplebits;
 271
 272         for (i = 0; i < rtd->num_codecs; i++)
 273                 symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;
 274
 275         if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
 276                 dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
 277                                 cpu_dai->sample_bits, sample_bits);
 278                 return -EINVAL;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
 285 {
 286         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 287         struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
 288         struct snd_soc_dai_link *link = rtd->dai_link;
 289         unsigned int symmetry, i;
 290
 291         symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
 292                 cpu_driver->symmetric_channels || link->symmetric_channels ||
 293                 cpu_driver->symmetric_samplebits || link->symmetric_samplebits;
 294
 295         for (i = 0; i < rtd->num_codecs; i++)
 296                 symmetry = symmetry ||
 297                         rtd->codec_dais[i]->driver->symmetric_rates ||
 298                         rtd->codec_dais[i]->driver->symmetric_channels ||
 299                         rtd->codec_dais[i]->driver->symmetric_samplebits;
 300
 301         return symmetry;
 302 }
 303
 304 /*
 305  * List of sample sizes that might go over the bus for parameter
 306  * application.  There ought to be a wildcard sample size for things
 307  * like the DAC/ADC resolution to use but there isn't right now.
 308  */
 309 static int sample_sizes[] = {
 310         24, 32,
 311 };
 312
 313 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 314 {
 315         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 316         int ret, i;
 317
 318         if (!bits)
 319                 return;
 320
 321         for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
 322                 if (bits >= sample_sizes[i])
 323                         continue;
 324
 325                 ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
 326                                                    sample_sizes[i], bits);
 327                 if (ret != 0)
 328                         dev_warn(rtd->dev,
 329                                  "ASoC: Failed to set MSB %d/%d: %d\n",
 330                                  bits, sample_sizes[i], ret);
 331         }
 332 }
 333
 334 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 335 {
 336         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 337         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 338         struct snd_soc_dai *codec_dai;
 339         int i;
 340         unsigned int bits = 0, cpu_bits;
 341
 342         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 343                 for (i = 0; i < rtd->num_codecs; i++) {
 344                         codec_dai = rtd->codec_dais[i];
 345                         if (codec_dai->driver->playback.sig_bits == 0) {
 346                                 bits = 0;
 347                                 break;
 348                         }
 349                         bits = max(codec_dai->driver->playback.sig_bits, bits);
 350                 }
 351                 cpu_bits = cpu_dai->driver->playback.sig_bits;
 352         } else {
 353                 for (i = 0; i < rtd->num_codecs; i++) {
 354                         codec_dai = rtd->codec_dais[i];
 355                         if (codec_dai->driver->capture.sig_bits == 0) {
 356                                 bits = 0;
 357                                 break;
 358                         }
 359                         bits = max(codec_dai->driver->capture.sig_bits, bits);
 360                 }
 361                 cpu_bits = cpu_dai->driver->capture.sig_bits;
 362         }
 363
 364         soc_pcm_set_msb(substream, bits);
 365         soc_pcm_set_msb(substream, cpu_bits);
 366 }
 367
 368 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 369 {
 370         struct snd_pcm_runtime *runtime = substream->runtime;
 371         struct snd_pcm_hardware *hw = &runtime->hw;
 372         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 373         struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
 374         struct snd_soc_dai_driver *codec_dai_drv;
 375         struct snd_soc_pcm_stream *codec_stream;
 376         struct snd_soc_pcm_stream *cpu_stream;
 377         unsigned int chan_min = 0, chan_max = UINT_MAX;
 378         unsigned int rate_min = 0, rate_max = UINT_MAX;
 379         unsigned int rates = UINT_MAX;
 380         u64 formats = ULLONG_MAX;
 381         int i;
 382
 383         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 384                 cpu_stream = &cpu_dai_drv->playback;
 385         else
 386                 cpu_stream = &cpu_dai_drv->capture;
 387
 388         /* first calculate min/max only for CODECs in the DAI link */
 389         for (i = 0; i < rtd->num_codecs; i++) {
 390                 codec_dai_drv = rtd->codec_dais[i]->driver;
 391                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 392                         codec_stream = &codec_dai_drv->playback;
 393                 else
 394                         codec_stream = &codec_dai_drv->capture;
 395                 chan_min = max(chan_min, codec_stream->channels_min);
 396                 chan_max = min(chan_max, codec_stream->channels_max);
 397                 rate_min = max(rate_min, codec_stream->rate_min);
 398                 rate_max = min_not_zero(rate_max, codec_stream->rate_max);
 399                 formats &= codec_stream->formats;
 400                 rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
 401         }
 402
 403         /*
 404          * chan min/max cannot be enforced if there are multiple CODEC DAIs
 405          * connected to a single CPU DAI, use CPU DAI's directly and let
 406          * channel allocation be fixed up later
 407          */
 408         if (rtd->num_codecs > 1) {
 409                 chan_min = cpu_stream->channels_min;
 410                 chan_max = cpu_stream->channels_max;
 411         }
 412
 413         hw->channels_min = max(chan_min, cpu_stream->channels_min);
 414         hw->channels_max = min(chan_max, cpu_stream->channels_max);
 415         if (hw->formats)
 416                 hw->formats &= formats & cpu_stream->formats;
 417         else
 418                 hw->formats = formats & cpu_stream->formats;
 419         hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);
 420
 421         snd_pcm_limit_hw_rates(runtime);
 422
 423         hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
 424         hw->rate_min = max(hw->rate_min, rate_min);
 425         hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
 426         hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 427 }
 428
 429 /*
 430  * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 431  * then initialized and any private data can be allocated. This also calls
 432  * startup for the cpu DAI, platform, machine and codec DAI.
 433  */
 434 static int soc_pcm_open(struct snd_pcm_substream *substream)
 435 {
 436         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 437         struct snd_pcm_runtime *runtime = substream->runtime;
 438         struct snd_soc_platform *platform = rtd->platform;
 439         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 440         struct snd_soc_dai *codec_dai;
 441         const char *codec_dai_name = "multicodec";
 442         int i, ret = 0;
 443
 444         pinctrl_pm_select_default_state(cpu_dai->dev);
 445         for (i = 0; i < rtd->num_codecs; i++)
 446                 pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
 447         pm_runtime_get_sync(cpu_dai->dev);
 448         for (i = 0; i < rtd->num_codecs; i++)
 449                 pm_runtime_get_sync(rtd->codec_dais[i]->dev);
 450         pm_runtime_get_sync(platform->dev);
 451
 452         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 453
 454         /* startup the audio subsystem */
 455         if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
 456                 ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
 457                 if (ret < 0) {
 458                         dev_err(cpu_dai->dev, "ASoC: can't open interface"
 459                                 " %s: %d\n", cpu_dai->name, ret);
 460                         goto out;
 461                 }
 462         }
 463
 464         if (platform->driver->ops && platform->driver->ops->open) {
 465                 ret = platform->driver->ops->open(substream);
 466                 if (ret < 0) {
 467                         dev_err(platform->dev, "ASoC: can't open platform"
 468                                 " %s: %d\n", platform->component.name, ret);
 469                         goto platform_err;
 470                 }
 471         }
 472
 473         for (i = 0; i < rtd->num_codecs; i++) {
 474                 codec_dai = rtd->codec_dais[i];
 475                 if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
 476                         ret = codec_dai->driver->ops->startup(substream,
 477                                                               codec_dai);
 478                         if (ret < 0) {
 479                                 dev_err(codec_dai->dev,
 480                                         "ASoC: can't open codec %s: %d\n",
 481                                         codec_dai->name, ret);
 482                                 goto codec_dai_err;
 483                         }
 484                 }
 485
 486                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 487                         codec_dai->tx_mask = 0;
 488                 else
 489                         codec_dai->rx_mask = 0;
 490         }
 491
 492         if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
 493                 ret = rtd->dai_link->ops->startup(substream);
 494                 if (ret < 0) {
 495                         pr_err("ASoC: %s startup failed: %d\n",
 496                                rtd->dai_link->name, ret);
 497                         goto machine_err;
 498                 }
 499         }
 500
 501         /* Dynamic PCM DAI links compat checks use dynamic capabilities */
 502         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
 503                 goto dynamic;
 504
 505         /* Check that the codec and cpu DAIs are compatible */
 506         soc_pcm_init_runtime_hw(substream);
 507
 508         if (rtd->num_codecs == 1)
 509                 codec_dai_name = rtd->codec_dai->name;
 510
 511         if (soc_pcm_has_symmetry(substream))
 512                 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 513
 514         ret = -EINVAL;
 515         if (!runtime->hw.rates) {
 516                 printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
 517                         codec_dai_name, cpu_dai->name);
 518                 goto config_err;
 519         }
 520         if (!runtime->hw.formats) {
 521                 printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
 522                         codec_dai_name, cpu_dai->name);
 523                 goto config_err;
 524         }
 525         if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
 526             runtime->hw.channels_min > runtime->hw.channels_max) {
 527                 printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
 528                                 codec_dai_name, cpu_dai->name);
 529                 goto config_err;
 530         }
 531
 532         soc_pcm_apply_msb(substream);
 533
 534         /* Symmetry only applies if we've already got an active stream. */
 535         if (cpu_dai->active) {
 536                 ret = soc_pcm_apply_symmetry(substream, cpu_dai);
 537                 if (ret != 0)
 538                         goto config_err;
 539         }
 540
 541         for (i = 0; i < rtd->num_codecs; i++) {
 542                 if (rtd->codec_dais[i]->active) {
 543                         ret = soc_pcm_apply_symmetry(substream,
 544                                                      rtd->codec_dais[i]);
 545                         if (ret != 0)
 546                                 goto config_err;
 547                 }
 548         }
 549
 550         pr_debug("ASoC: %s <-> %s info:\n",
 551                         codec_dai_name, cpu_dai->name);
 552         pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
 553         pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
 554                  runtime->hw.channels_max);
 555         pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
 556                  runtime->hw.rate_max);
 557
 558 dynamic:
 559
 560         snd_soc_runtime_activate(rtd, substream->stream);
 561
 562         mutex_unlock(&rtd->pcm_mutex);
 563         return 0;
 564
 565 config_err:
 566         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 567                 rtd->dai_link->ops->shutdown(substream);
 568
 569 machine_err:
 570         i = rtd->num_codecs;
 571
 572 codec_dai_err:
 573         while (--i >= 0) {
 574                 codec_dai = rtd->codec_dais[i];
 575                 if (codec_dai->driver->ops->shutdown)
 576                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 577         }
 578
 579         if (platform->driver->ops && platform->driver->ops->close)
 580                 platform->driver->ops->close(substream);
 581
 582 platform_err:
 583         if (cpu_dai->driver->ops->shutdown)
 584                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 585 out:
 586         mutex_unlock(&rtd->pcm_mutex);
 587
 588         pm_runtime_put(platform->dev);
 589         for (i = 0; i < rtd->num_codecs; i++)
 590                 pm_runtime_put(rtd->codec_dais[i]->dev);
 591         pm_runtime_put(cpu_dai->dev);
 592         for (i = 0; i < rtd->num_codecs; i++) {
 593                 if (!rtd->codec_dais[i]->active)
 594                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 595         }
 596         if (!cpu_dai->active)
 597                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 598
 599         return ret;
 600 }
 601
 602 /*
 603  * Power down the audio subsystem pmdown_time msecs after close is called.
 604  * This is to ensure there are no pops or clicks in between any music tracks
 605  * due to DAPM power cycling.
 606  */
 607 static void close_delayed_work(struct work_struct *work)
 608 {
 609         struct snd_soc_pcm_runtime *rtd =
 610                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 611         struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
 612
 613         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 614
 615         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
 616                  codec_dai->driver->playback.stream_name,
 617                  codec_dai->playback_active ? "active" : "inactive",
 618                  rtd->pop_wait ? "yes" : "no");
 619
 620         /* are we waiting on this codec DAI stream */
 621         if (rtd->pop_wait == 1) {
 622                 rtd->pop_wait = 0;
 623                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 624                                           SND_SOC_DAPM_STREAM_STOP);
 625         }
 626
 627         mutex_unlock(&rtd->pcm_mutex);
 628 }
 629
 630 /*
 631  * Called by ALSA when a PCM substream is closed. Private data can be
 632  * freed here. The cpu DAI, codec DAI, machine and platform are also
 633  * shutdown.
 634  */
 635 static int soc_pcm_close(struct snd_pcm_substream *substream)
 636 {
 637         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 638         struct snd_soc_platform *platform = rtd->platform;
 639         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 640         struct snd_soc_dai *codec_dai;
 641         int i;
 642
 643         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 644
 645         snd_soc_runtime_deactivate(rtd, substream->stream);
 646
 647         /* clear the corresponding DAIs rate when inactive */
 648         if (!cpu_dai->active)
 649                 cpu_dai->rate = 0;
 650
 651         for (i = 0; i < rtd->num_codecs; i++) {
 652                 codec_dai = rtd->codec_dais[i];
 653                 if (!codec_dai->active)
 654                         codec_dai->rate = 0;
 655         }
 656
 657         snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream);
 658
 659         if (cpu_dai->driver->ops->shutdown)
 660                 cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 661
 662         for (i = 0; i < rtd->num_codecs; i++) {
 663                 codec_dai = rtd->codec_dais[i];
 664                 if (codec_dai->driver->ops->shutdown)
 665                         codec_dai->driver->ops->shutdown(substream, codec_dai);
 666         }
 667
 668         if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
 669                 rtd->dai_link->ops->shutdown(substream);
 670
 671         if (platform->driver->ops && platform->driver->ops->close)
 672                 platform->driver->ops->close(substream);
 673
 674         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 675                 if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
 676                         /* powered down playback stream now */
 677                         snd_soc_dapm_stream_event(rtd,
 678                                                   SNDRV_PCM_STREAM_PLAYBACK,
 679                                                   SND_SOC_DAPM_STREAM_STOP);
 680                 } else {
 681                         /* start delayed pop wq here for playback streams */
 682                         rtd->pop_wait = 1;
 683                         queue_delayed_work(system_power_efficient_wq,
 684                                            &rtd->delayed_work,
 685                                            msecs_to_jiffies(rtd->pmdown_time));
 686                 }
 687         } else {
 688                 /* capture streams can be powered down now */
 689                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 690                                           SND_SOC_DAPM_STREAM_STOP);
 691         }
 692
 693         mutex_unlock(&rtd->pcm_mutex);
 694
 695         pm_runtime_put(platform->dev);
 696         for (i = 0; i < rtd->num_codecs; i++)
 697                 pm_runtime_put(rtd->codec_dais[i]->dev);
 698         pm_runtime_put(cpu_dai->dev);
 699         for (i = 0; i < rtd->num_codecs; i++) {
 700                 if (!rtd->codec_dais[i]->active)
 701                         pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev);
 702         }
 703         if (!cpu_dai->active)
 704                 pinctrl_pm_select_sleep_state(cpu_dai->dev);
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * Called by ALSA when the PCM substream is prepared, can set format, sample
 711  * rate, etc.  This function is non atomic and can be called multiple times,
 712  * it can refer to the runtime info.
 713  */
 714 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 715 {
 716         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 717         struct snd_soc_platform *platform = rtd->platform;
 718         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 719         struct snd_soc_dai *codec_dai;
 720         int i, ret = 0;
 721
 722         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 723
 724         if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 725                 ret = rtd->dai_link->ops->prepare(substream);
 726                 if (ret < 0) {
 727                         dev_err(rtd->card->dev, "ASoC: machine prepare error:"
 728                                 " %d\n", ret);
 729                         goto out;
 730                 }
 731         }
 732
 733         if (platform->driver->ops && platform->driver->ops->prepare) {
 734                 ret = platform->driver->ops->prepare(substream);
 735                 if (ret < 0) {
 736                         dev_err(platform->dev, "ASoC: platform prepare error:"
 737                                 " %d\n", ret);
 738                         goto out;
 739                 }
 740         }
 741
 742         for (i = 0; i < rtd->num_codecs; i++) {
 743                 codec_dai = rtd->codec_dais[i];
 744                 if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) {
 745                         ret = codec_dai->driver->ops->prepare(substream,
 746                                                               codec_dai);
 747                         if (ret < 0) {
 748                                 dev_err(codec_dai->dev,
 749                                         "ASoC: DAI prepare error: %d\n", ret);
 750                                 goto out;
 751                         }
 752                 }
 753         }
 754
 755         if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) {
 756                 ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 757                 if (ret < 0) {
 758                         dev_err(cpu_dai->dev, "ASoC: DAI prepare error: %d\n",
 759                                 ret);
 760                         goto out;
 761                 }
 762         }
 763
 764         /* cancel any delayed stream shutdown that is pending */
 765         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 766             rtd->pop_wait) {
 767                 rtd->pop_wait = 0;
 768                 cancel_delayed_work(&rtd->delayed_work);
 769         }
 770
 771         snd_soc_dapm_stream_event(rtd, substream->stream,
 772                         SND_SOC_DAPM_STREAM_START);
 773
 774         for (i = 0; i < rtd->num_codecs; i++)
 775                 snd_soc_dai_digital_mute(rtd->codec_dais[i], 0,
 776                                          substream->stream);
 777         snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
 778
 779 out:
 780         mutex_unlock(&rtd->pcm_mutex);
 781         return ret;
 782 }
 783
 784 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
 785                                        unsigned int mask)
 786 {
 787         struct snd_interval *interval;
 788         int channels = hweight_long(mask);
 789
 790         interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 791         interval->min = channels;
 792         interval->max = channels;
 793 }
 794
 795 int soc_dai_hw_params(struct snd_pcm_substream *substream,
 796                       struct snd_pcm_hw_params *params,
 797                       struct snd_soc_dai *dai)
 798 {
 799         int ret;
 800
 801         if (dai->driver->ops && dai->driver->ops->hw_params) {
 802                 ret = dai->driver->ops->hw_params(substream, params, dai);
 803                 if (ret < 0) {
 804                         dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n",
 805                                 dai->name, ret);
 806                         return ret;
 807                 }
 808         }
 809
 810         return 0;
 811 }
 812
 813 /*
 814  * Called by ALSA when the hardware params are set by application. This
 815  * function can also be called multiple times and can allocate buffers
 816  * (using snd_pcm_lib_* ). It's non-atomic.
 817  */
 818 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 819                                 struct snd_pcm_hw_params *params)
 820 {
 821         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 822         struct snd_soc_platform *platform = rtd->platform;
 823         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 824         int i, ret = 0;
 825
 826         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 827
 828         ret = soc_pcm_params_symmetry(substream, params);
 829         if (ret)
 830                 goto out;
 831
 832         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 833                 ret = rtd->dai_link->ops->hw_params(substream, params);
 834                 if (ret < 0) {
 835                         dev_err(rtd->card->dev, "ASoC: machine hw_params"
 836                                 " failed: %d\n", ret);
 837                         goto out;
 838                 }
 839         }
 840
 841         for (i = 0; i < rtd->num_codecs; i++) {
 842                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 843                 struct snd_pcm_hw_params codec_params;
 844
 845                 /* copy params for each codec */
 846                 codec_params = *params;
 847
 848                 /* fixup params based on TDM slot masks */
 849                 if (codec_dai->tx_mask)
 850                         soc_pcm_codec_params_fixup(&codec_params,
 851                                                    codec_dai->tx_mask);
 852                 if (codec_dai->rx_mask)
 853                         soc_pcm_codec_params_fixup(&codec_params,
 854                                                    codec_dai->rx_mask);
 855
 856                 ret = soc_dai_hw_params(substream, &codec_params, codec_dai);
 857                 if(ret < 0)
 858                         goto codec_err;
 859
 860                 codec_dai->rate = params_rate(&codec_params);
 861                 codec_dai->channels = params_channels(&codec_params);
 862                 codec_dai->sample_bits = snd_pcm_format_physical_width(
 863                                                 params_format(&codec_params));
 864         }
 865
 866         ret = soc_dai_hw_params(substream, params, cpu_dai);
 867         if (ret < 0)
 868                 goto interface_err;
 869
 870         if (platform->driver->ops && platform->driver->ops->hw_params) {
 871                 ret = platform->driver->ops->hw_params(substream, params);
 872                 if (ret < 0) {
 873                         dev_err(platform->dev, "ASoC: %s hw params failed: %d\n",
 874                                platform->component.name, ret);
 875                         goto platform_err;
 876                 }
 877         }
 878
 879         /* store the parameters for each DAIs */
 880         cpu_dai->rate = params_rate(params);
 881         cpu_dai->channels = params_channels(params);
 882         cpu_dai->sample_bits =
 883                 snd_pcm_format_physical_width(params_format(params));
 884
 885 out:
 886         mutex_unlock(&rtd->pcm_mutex);
 887         return ret;
 888
 889 platform_err:
 890         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 891                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 892
 893 interface_err:
 894         i = rtd->num_codecs;
 895
 896 codec_err:
 897         while (--i >= 0) {
 898                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 899                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 900                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 901                 codec_dai->rate = 0;
 902         }
 903
 904         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 905                 rtd->dai_link->ops->hw_free(substream);
 906
 907         mutex_unlock(&rtd->pcm_mutex);
 908         return ret;
 909 }
 910
 911 /*
 912  * Frees resources allocated by hw_params, can be called multiple times
 913  */
 914 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 915 {
 916         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 917         struct snd_soc_platform *platform = rtd->platform;
 918         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 919         struct snd_soc_dai *codec_dai;
 920         bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 921         int i;
 922
 923         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 924
 925         /* clear the corresponding DAIs parameters when going to be inactive */
 926         if (cpu_dai->active == 1) {
 927                 cpu_dai->rate = 0;
 928                 cpu_dai->channels = 0;
 929                 cpu_dai->sample_bits = 0;
 930         }
 931
 932         for (i = 0; i < rtd->num_codecs; i++) {
 933                 codec_dai = rtd->codec_dais[i];
 934                 if (codec_dai->active == 1) {
 935                         codec_dai->rate = 0;
 936                         codec_dai->channels = 0;
 937                         codec_dai->sample_bits = 0;
 938                 }
 939         }
 940
 941         /* apply codec digital mute */
 942         for (i = 0; i < rtd->num_codecs; i++) {
 943                 if ((playback && rtd->codec_dais[i]->playback_active == 1) ||
 944                     (!playback && rtd->codec_dais[i]->capture_active == 1))
 945                         snd_soc_dai_digital_mute(rtd->codec_dais[i], 1,
 946                                                  substream->stream);
 947         }
 948
 949         /* free any machine hw params */
 950         if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 951                 rtd->dai_link->ops->hw_free(substream);
 952
 953         /* free any DMA resources */
 954         if (platform->driver->ops && platform->driver->ops->hw_free)
 955                 platform->driver->ops->hw_free(substream);
 956
 957         /* now free hw params for the DAIs  */
 958         for (i = 0; i < rtd->num_codecs; i++) {
 959                 codec_dai = rtd->codec_dais[i];
 960                 if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free)
 961                         codec_dai->driver->ops->hw_free(substream, codec_dai);
 962         }
 963
 964         if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free)
 965                 cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 966
 967         mutex_unlock(&rtd->pcm_mutex);
 968         return 0;
 969 }
 970
 971 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 972 {
 973         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 974         struct snd_soc_platform *platform = rtd->platform;
 975         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 976         struct snd_soc_dai *codec_dai;
 977         int i, ret;
 978
 979         for (i = 0; i < rtd->num_codecs; i++) {
 980                 codec_dai = rtd->codec_dais[i];
 981                 if (codec_dai->driver->ops && codec_dai->driver->ops->trigger) {
 982                         ret = codec_dai->driver->ops->trigger(substream,
 983                                                               cmd, codec_dai);
 984                         if (ret < 0)
 985                                 return ret;
 986                 }
 987         }
 988
 989         if (platform->driver->ops && platform->driver->ops->trigger) {
 990                 ret = platform->driver->ops->trigger(substream, cmd);
 991                 if (ret < 0)
 992                         return ret;
 993         }
 994
 995         if (cpu_dai->driver->ops && cpu_dai->driver->ops->trigger) {
 996                 ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 997                 if (ret < 0)
 998                         return ret;
 999         }
1000
1001         if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) {
1002                 ret = rtd->dai_link->ops->trigger(substream, cmd);
1003                 if (ret < 0)
1004                         return ret;
1005         }
1006
1007         return 0;
1008 }
1009
1010 static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
1011                                    int cmd)
1012 {
1013         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1014         struct snd_soc_platform *platform = rtd->platform;
1015         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1016         struct snd_soc_dai *codec_dai;
1017         int i, ret;
1018
1019         for (i = 0; i < rtd->num_codecs; i++) {
1020                 codec_dai = rtd->codec_dais[i];
1021                 if (codec_dai->driver->ops &&
1022                     codec_dai->driver->ops->bespoke_trigger) {
1023                         ret = codec_dai->driver->ops->bespoke_trigger(substream,
1024                                                                 cmd, codec_dai);
1025                         if (ret < 0)
1026                                 return ret;
1027                 }
1028         }
1029
1030         if (platform->driver->bespoke_trigger) {
1031                 ret = platform->driver->bespoke_trigger(substream, cmd);
1032                 if (ret < 0)
1033                         return ret;
1034         }
1035
1036         if (cpu_dai->driver->ops && cpu_dai->driver->ops->bespoke_trigger) {
1037                 ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
1038                 if (ret < 0)
1039                         return ret;
1040         }
1041         return 0;
1042 }
1043 /*
1044  * soc level wrapper for pointer callback
1045  * If cpu_dai, codec_dai, platform driver has the delay callback, than
1046  * the runtime->delay will be updated accordingly.
1047  */
1048 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
1049 {
1050         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1051         struct snd_soc_platform *platform = rtd->platform;
1052         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1053         struct snd_soc_dai *codec_dai;
1054         struct snd_pcm_runtime *runtime = substream->runtime;
1055         snd_pcm_uframes_t offset = 0;
1056         snd_pcm_sframes_t delay = 0;
1057         snd_pcm_sframes_t codec_delay = 0;
1058         int i;
1059
1060         if (platform->driver->ops && platform->driver->ops->pointer)
1061                 offset = platform->driver->ops->pointer(substream);
1062
1063         if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)
1064                 delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
1065
1066         for (i = 0; i < rtd->num_codecs; i++) {
1067                 codec_dai = rtd->codec_dais[i];
1068                 if (codec_dai->driver->ops && codec_dai->driver->ops->delay)
1069                         codec_delay = max(codec_delay,
1070                                         codec_dai->driver->ops->delay(substream,
1071                                                                     codec_dai));
1072         }
1073         delay += codec_delay;
1074
1075         /*
1076          * None of the existing platform drivers implement delay(), so
1077          * for now the codec_dai of first multicodec entry is used
1078          */
1079         if (platform->driver->delay)
1080                 delay += platform->driver->delay(substream, rtd->codec_dais[0]);
1081
1082         runtime->delay = delay;
1083
1084         return offset;
1085 }
1086
1087 /* connect a FE and BE */
1088 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
1089                 struct snd_soc_pcm_runtime *be, int stream)
1090 {
1091         struct snd_soc_dpcm *dpcm;
1092
1093         /* only add new dpcms */
1094         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1095                 if (dpcm->be == be && dpcm->fe == fe)
1096                         return 0;
1097         }
1098
1099         dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
1100         if (!dpcm)
1101                 return -ENOMEM;
1102
1103         dpcm->be = be;
1104         dpcm->fe = fe;
1105         be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
1106         dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
1107         list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
1108         list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
1109
1110         dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
1111                         stream ? "capture" : "playback",  fe->dai_link->name,
1112                         stream ? "<-" : "->", be->dai_link->name);
1113
1114 #ifdef CONFIG_DEBUG_FS
1115         dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
1116                         fe->debugfs_dpcm_root, &dpcm->state);
1117 #endif
1118         return 1;
1119 }
1120
1121 /* reparent a BE onto another FE */
1122 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
1123                         struct snd_soc_pcm_runtime *be, int stream)
1124 {
1125         struct snd_soc_dpcm *dpcm;
1126         struct snd_pcm_substream *fe_substream, *be_substream;
1127
1128         /* reparent if BE is connected to other FEs */
1129         if (!be->dpcm[stream].users)
1130                 return;
1131
1132         be_substream = snd_soc_dpcm_get_substream(be, stream);
1133
1134         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
1135                 if (dpcm->fe == fe)
1136                         continue;
1137
1138                 dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
1139                         stream ? "capture" : "playback",
1140                         dpcm->fe->dai_link->name,
1141                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1142
1143                 fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
1144                 be_substream->runtime = fe_substream->runtime;
1145                 break;
1146         }
1147 }
1148
1149 /* disconnect a BE and FE */
1150 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
1151 {
1152         struct snd_soc_dpcm *dpcm, *d;
1153
1154         list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
1155                 dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
1156                                 stream ? "capture" : "playback",
1157                                 dpcm->be->dai_link->name);
1158
1159                 if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
1160                         continue;
1161
1162                 dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
1163                         stream ? "capture" : "playback", fe->dai_link->name,
1164                         stream ? "<-" : "->", dpcm->be->dai_link->name);
1165
1166                 /* BEs still alive need new FE */
1167                 dpcm_be_reparent(fe, dpcm->be, stream);
1168
1169 #ifdef CONFIG_DEBUG_FS
1170                 debugfs_remove(dpcm->debugfs_state);
1171 #endif
1172                 list_del(&dpcm->list_be);
1173                 list_del(&dpcm->list_fe);
1174                 kfree(dpcm);
1175         }
1176 }
1177
1178 /* get BE for DAI widget and stream */
1179 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
1180                 struct snd_soc_dapm_widget *widget, int stream)
1181 {
1182         struct snd_soc_pcm_runtime *be;
1183         int i, j;
1184
1185         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
1186                 for (i = 0; i < card->num_links; i++) {
1187                         be = &card->rtd[i];
1188
1189                         if (!be->dai_link->no_pcm)
1190                                 continue;
1191
1192                         if (be->cpu_dai->playback_widget == widget)
1193                                 return be;
1194
1195                         for (j = 0; j < be->num_codecs; j++) {
1196                                 struct snd_soc_dai *dai = be->codec_dais[j];
1197                                 if (dai->playback_widget == widget)
1198                                         return be;
1199                         }
1200                 }
1201         } else {
1202
1203                 for (i = 0; i < card->num_links; i++) {
1204                         be = &card->rtd[i];
1205
1206                         if (!be->dai_link->no_pcm)
1207                                 continue;
1208
1209                         if (be->cpu_dai->capture_widget == widget)
1210                                 return be;
1211
1212                         for (j = 0; j < be->num_codecs; j++) {
1213                                 struct snd_soc_dai *dai = be->codec_dais[j];
1214                                 if (dai->capture_widget == widget)
1215                                         return be;
1216                         }
1217                 }
1218         }
1219
1220         dev_err(card->dev, "ASoC: can't get %s BE for %s\n",
1221                 stream ? "capture" : "playback", widget->name);
1222         return NULL;
1223 }
1224
1225 static inline struct snd_soc_dapm_widget *
1226         dai_get_widget(struct snd_soc_dai *dai, int stream)
1227 {
1228         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1229                 return dai->playback_widget;
1230         else
1231                 return dai->capture_widget;
1232 }
1233
1234 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
1235                 struct snd_soc_dapm_widget *widget)
1236 {
1237         int i;
1238
1239         for (i = 0; i < list->num_widgets; i++) {
1240                 if (widget == list->widgets[i])
1241                         return 1;
1242         }
1243
1244         return 0;
1245 }
1246
1247 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
1248         int stream, struct snd_soc_dapm_widget_list **list_)
1249 {
1250         struct snd_soc_dai *cpu_dai = fe->cpu_dai;
1251         struct snd_soc_dapm_widget_list *list;
1252         int paths;
1253
1254         list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
1255                         sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
1256         if (list == NULL)
1257                 return -ENOMEM;
1258
1259         /* get number of valid DAI paths and their widgets */
1260         paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
1261
1262         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
1263                         stream ? "capture" : "playback");
1264
1265         *list_ = list;
1266         return paths;
1267 }
1268
1269 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
1270         struct snd_soc_dapm_widget_list **list_)
1271 {
1272         struct snd_soc_dpcm *dpcm;
1273         struct snd_soc_dapm_widget_list *list = *list_;
1274         struct snd_soc_dapm_widget *widget;
1275         int prune = 0;
1276
1277         /* Destroy any old FE <--> BE connections */
1278         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1279                 unsigned int i;
1280
1281                 /* is there a valid CPU DAI widget for this BE */
1282                 widget = dai_get_widget(dpcm->be->cpu_dai, stream);
1283
1284                 /* prune the BE if it's no longer in our active list */
1285                 if (widget && widget_in_list(list, widget))
1286                         continue;
1287
1288                 /* is there a valid CODEC DAI widget for this BE */
1289                 for (i = 0; i < dpcm->be->num_codecs; i++) {
1290                         struct snd_soc_dai *dai = dpcm->be->codec_dais[i];
1291                         widget = dai_get_widget(dai, stream);
1292
1293                         /* prune the BE if it's no longer in our active list */
1294                         if (widget && widget_in_list(list, widget))
1295                                 continue;
1296                 }
1297
1298                 dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
1299                         stream ? "capture" : "playback",
1300                         dpcm->be->dai_link->name, fe->dai_link->name);
1301                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
1302                 dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1303                 prune++;
1304         }
1305
1306         dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
1307         return prune;
1308 }
1309
1310 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
1311         struct snd_soc_dapm_widget_list **list_)
1312 {
1313         struct snd_soc_card *card = fe->card;
1314         struct snd_soc_dapm_widget_list *list = *list_;
1315         struct snd_soc_pcm_runtime *be;
1316         int i, new = 0, err;
1317
1318         /* Create any new FE <--> BE connections */
1319         for (i = 0; i < list->num_widgets; i++) {
1320
1321                 switch (list->widgets[i]->id) {
1322                 case snd_soc_dapm_dai_in:
1323                 case snd_soc_dapm_dai_out:
1324                         break;
1325                 default:
1326                         continue;
1327                 }
1328
1329                 /* is there a valid BE rtd for this widget */
1330                 be = dpcm_get_be(card, list->widgets[i], stream);
1331                 if (!be) {
1332                         dev_err(fe->dev, "ASoC: no BE found for %s\n",
1333                                         list->widgets[i]->name);
1334                         continue;
1335                 }
1336
1337                 /* make sure BE is a real BE */
1338                 if (!be->dai_link->no_pcm)
1339                         continue;
1340
1341                 /* don't connect if FE is not running */
1342                 if (!fe->dpcm[stream].runtime && !fe->fe_compr)
1343                         continue;
1344
1345                 /* newly connected FE and BE */
1346                 err = dpcm_be_connect(fe, be, stream);
1347                 if (err < 0) {
1348                         dev_err(fe->dev, "ASoC: can't connect %s\n",
1349                                 list->widgets[i]->name);
1350                         break;
1351                 } else if (err == 0) /* already connected */
1352                         continue;
1353
1354                 /* new */
1355                 be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
1356                 new++;
1357         }
1358
1359         dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
1360         return new;
1361 }
1362
1363 /*
1364  * Find the corresponding BE DAIs that source or sink audio to this
1365  * FE substream.
1366  */
1367 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
1368         int stream, struct snd_soc_dapm_widget_list **list, int new)
1369 {
1370         if (new)
1371                 return dpcm_add_paths(fe, stream, list);
1372         else
1373                 return dpcm_prune_paths(fe, stream, list);
1374 }
1375
1376 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
1377 {
1378         struct snd_soc_dpcm *dpcm;
1379
1380         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
1381                 dpcm->be->dpcm[stream].runtime_update =
1382                                                 SND_SOC_DPCM_UPDATE_NO;
1383 }
1384
1385 static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
1386         int stream)
1387 {
1388         struct snd_soc_dpcm *dpcm;
1389
1390         /* disable any enabled and non active backends */
1391         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1392
1393                 struct snd_soc_pcm_runtime *be = dpcm->be;
1394                 struct snd_pcm_substream *be_substream =
1395                         snd_soc_dpcm_get_substream(be, stream);
1396
1397                 if (be->dpcm[stream].users == 0)
1398                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1399                                 stream ? "capture" : "playback",
1400                                 be->dpcm[stream].state);
1401
1402                 if (--be->dpcm[stream].users != 0)
1403                         continue;
1404
1405                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1406                         continue;
1407
1408                 soc_pcm_close(be_substream);
1409                 be_substream->runtime = NULL;
1410                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1411         }
1412 }
1413
1414 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
1415 {
1416         struct snd_soc_dpcm *dpcm;
1417         int err, count = 0;
1418
1419         /* only startup BE DAIs that are either sinks or sources to this FE DAI */
1420         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1421
1422                 struct snd_soc_pcm_runtime *be = dpcm->be;
1423                 struct snd_pcm_substream *be_substream =
1424                         snd_soc_dpcm_get_substream(be, stream);
1425
1426                 if (!be_substream) {
1427                         dev_err(be->dev, "ASoC: no backend %s stream\n",
1428                                 stream ? "capture" : "playback");
1429                         continue;
1430                 }
1431
1432                 /* is this op for this BE ? */
1433                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1434                         continue;
1435
1436                 /* first time the dpcm is open ? */
1437                 if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
1438                         dev_err(be->dev, "ASoC: too many users %s at open %d\n",
1439                                 stream ? "capture" : "playback",
1440                                 be->dpcm[stream].state);
1441
1442                 if (be->dpcm[stream].users++ != 0)
1443                         continue;
1444
1445                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
1446                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
1447                         continue;
1448
1449                 dev_dbg(be->dev, "ASoC: open %s BE %s\n",
1450                         stream ? "capture" : "playback", be->dai_link->name);
1451
1452                 be_substream->runtime = be->dpcm[stream].runtime;
1453                 err = soc_pcm_open(be_substream);
1454                 if (err < 0) {
1455                         dev_err(be->dev, "ASoC: BE open failed %d\n", err);
1456                         be->dpcm[stream].users--;
1457                         if (be->dpcm[stream].users < 0)
1458                                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
1459                                         stream ? "capture" : "playback",
1460                                         be->dpcm[stream].state);
1461
1462                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1463                         goto unwind;
1464                 }
1465
1466                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1467                 count++;
1468         }
1469
1470         return count;
1471
1472 unwind:
1473         /* disable any enabled and non active backends */
1474         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1475                 struct snd_soc_pcm_runtime *be = dpcm->be;
1476                 struct snd_pcm_substream *be_substream =
1477                         snd_soc_dpcm_get_substream(be, stream);
1478
1479                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1480                         continue;
1481
1482                 if (be->dpcm[stream].users == 0)
1483                         dev_err(be->dev, "ASoC: no users %s at close %d\n",
1484                                 stream ? "capture" : "playback",
1485                                 be->dpcm[stream].state);
1486
1487                 if (--be->dpcm[stream].users != 0)
1488                         continue;
1489
1490                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
1491                         continue;
1492
1493                 soc_pcm_close(be_substream);
1494                 be_substream->runtime = NULL;
1495                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1496         }
1497
1498         return err;
1499 }
1500
1501 static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime,
1502         struct snd_soc_pcm_stream *stream)
1503 {
1504         runtime->hw.rate_min = stream->rate_min;
1505         runtime->hw.rate_max = stream->rate_max;
1506         runtime->hw.channels_min = stream->channels_min;
1507         runtime->hw.channels_max = stream->channels_max;
1508         if (runtime->hw.formats)
1509                 runtime->hw.formats &= stream->formats;
1510         else
1511                 runtime->hw.formats = stream->formats;
1512         runtime->hw.rates = stream->rates;
1513 }
1514
1515 static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
1516 {
1517         struct snd_pcm_runtime *runtime = substream->runtime;
1518         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1519         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
1520         struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
1521
1522         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1523                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
1524         else
1525                 dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture);
1526 }
1527
1528 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
1529
1530 /* Set FE's runtime_update state; the state is protected via PCM stream lock
1531  * for avoiding the race with trigger callback.
1532  * If the state is unset and a trigger is pending while the previous operation,
1533  * process the pending trigger action here.
1534  */
1535 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
1536                                      int stream, enum snd_soc_dpcm_update state)
1537 {
1538         struct snd_pcm_substream *substream =
1539                 snd_soc_dpcm_get_substream(fe, stream);
1540
1541         snd_pcm_stream_lock_irq(substream);
1542         if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
1543                 dpcm_fe_dai_do_trigger(substream,
1544                                        fe->dpcm[stream].trigger_pending - 1);
1545                 fe->dpcm[stream].trigger_pending = 0;
1546         }
1547         fe->dpcm[stream].runtime_update = state;
1548         snd_pcm_stream_unlock_irq(substream);
1549 }
1550
1551 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
1552 {
1553         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
1554         struct snd_pcm_runtime *runtime = fe_substream->runtime;
1555         int stream = fe_substream->stream, ret = 0;
1556
1557         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1558
1559         ret = dpcm_be_dai_startup(fe, fe_substream->stream);
1560         if (ret < 0) {
1561                 dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret);
1562                 goto be_err;
1563         }
1564
1565         dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
1566
1567         /* start the DAI frontend */
1568         ret = soc_pcm_open(fe_substream);
1569         if (ret < 0) {
1570                 dev_err(fe->dev,"ASoC: failed to start FE %d\n", ret);
1571                 goto unwind;
1572         }
1573
1574         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
1575
1576         dpcm_set_fe_runtime(fe_substream);
1577         snd_pcm_limit_hw_rates(runtime);
1578
1579         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1580         return 0;
1581
1582 unwind:
1583         dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
1584 be_err:
1585         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1586         return ret;
1587 }
1588
1589 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
1590 {
1591         struct snd_soc_dpcm *dpcm;
1592
1593         /* only shutdown BEs that are either sinks or sources to this FE DAI */
1594         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1595
1596                 struct snd_soc_pcm_runtime *be = dpcm->be;
1597                 struct snd_pcm_substream *be_substream =
1598                         snd_soc_dpcm_get_substream(be, stream);
1599
1600                 /* is this op for this BE ? */
1601                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1602                         continue;
1603
1604                 if (be->dpcm[stream].users == 0)
1605                         dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
1606                                 stream ? "capture" : "playback",
1607                                 be->dpcm[stream].state);
1608
1609                 if (--be->dpcm[stream].users != 0)
1610                         continue;
1611
1612                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1613                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
1614                         continue;
1615
1616                 dev_dbg(be->dev, "ASoC: close BE %s\n",
1617                         dpcm->fe->dai_link->name);
1618
1619                 soc_pcm_close(be_substream);
1620                 be_substream->runtime = NULL;
1621
1622                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1623         }
1624         return 0;
1625 }
1626
1627 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
1628 {
1629         struct snd_soc_pcm_runtime *fe = substream->private_data;
1630         int stream = substream->stream;
1631
1632         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1633
1634         /* shutdown the BEs */
1635         dpcm_be_dai_shutdown(fe, substream->stream);
1636
1637         dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
1638
1639         /* now shutdown the frontend */
1640         soc_pcm_close(substream);
1641
1642         /* run the stream event for each BE */
1643         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
1644
1645         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
1646         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1647         return 0;
1648 }
1649
1650 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
1651 {
1652         struct snd_soc_dpcm *dpcm;
1653
1654         /* only hw_params backends that are either sinks or sources
1655          * to this frontend DAI */
1656         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1657
1658                 struct snd_soc_pcm_runtime *be = dpcm->be;
1659                 struct snd_pcm_substream *be_substream =
1660                         snd_soc_dpcm_get_substream(be, stream);
1661
1662                 /* is this op for this BE ? */
1663                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1664                         continue;
1665
1666                 /* only free hw when no longer used - check all FEs */
1667                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1668                                 continue;
1669
1670                 /* do not free hw if this BE is used by other FE */
1671                 if (be->dpcm[stream].users > 1)
1672                         continue;
1673
1674                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1675                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1676                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1677                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
1678                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1679                         continue;
1680
1681                 dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
1682                         dpcm->fe->dai_link->name);
1683
1684                 soc_pcm_hw_free(be_substream);
1685
1686                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1687         }
1688
1689         return 0;
1690 }
1691
1692 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1693 {
1694         struct snd_soc_pcm_runtime *fe = substream->private_data;
1695         int err, stream = substream->stream;
1696
1697         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1698         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1699
1700         dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
1701
1702         /* call hw_free on the frontend */
1703         err = soc_pcm_hw_free(substream);
1704         if (err < 0)
1705                 dev_err(fe->dev,"ASoC: hw_free FE %s failed\n",
1706                         fe->dai_link->name);
1707
1708         /* only hw_params backends that are either sinks or sources
1709          * to this frontend DAI */
1710         err = dpcm_be_dai_hw_free(fe, stream);
1711
1712         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
1713         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1714
1715         mutex_unlock(&fe->card->mutex);
1716         return 0;
1717 }
1718
1719 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
1720 {
1721         struct snd_soc_dpcm *dpcm;
1722         int ret;
1723
1724         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1725
1726                 struct snd_soc_pcm_runtime *be = dpcm->be;
1727                 struct snd_pcm_substream *be_substream =
1728                         snd_soc_dpcm_get_substream(be, stream);
1729
1730                 /* is this op for this BE ? */
1731                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1732                         continue;
1733
1734                 /* only allow hw_params() if no connected FEs are running */
1735                 if (!snd_soc_dpcm_can_be_params(fe, be, stream))
1736                         continue;
1737
1738                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1739                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1740                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
1741                         continue;
1742
1743                 dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
1744                         dpcm->fe->dai_link->name);
1745
1746                 /* copy params for each dpcm */
1747                 memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
1748                                 sizeof(struct snd_pcm_hw_params));
1749
1750                 /* perform any hw_params fixups */
1751                 if (be->dai_link->be_hw_params_fixup) {
1752                         ret = be->dai_link->be_hw_params_fixup(be,
1753                                         &dpcm->hw_params);
1754                         if (ret < 0) {
1755                                 dev_err(be->dev,
1756                                         "ASoC: hw_params BE fixup failed %d\n",
1757                                         ret);
1758                                 goto unwind;
1759                         }
1760                 }
1761
1762                 ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
1763                 if (ret < 0) {
1764                         dev_err(dpcm->be->dev,
1765                                 "ASoC: hw_params BE failed %d\n", ret);
1766                         goto unwind;
1767                 }
1768
1769                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1770         }
1771         return 0;
1772
1773 unwind:
1774         /* disable any enabled and non active backends */
1775         list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1776                 struct snd_soc_pcm_runtime *be = dpcm->be;
1777                 struct snd_pcm_substream *be_substream =
1778                         snd_soc_dpcm_get_substream(be, stream);
1779
1780                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1781                         continue;
1782
1783                 /* only allow hw_free() if no connected FEs are running */
1784                 if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1785                         continue;
1786
1787                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
1788                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
1789                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
1790                    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1791                         continue;
1792
1793                 soc_pcm_hw_free(be_substream);
1794         }
1795
1796         return ret;
1797 }
1798
1799 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
1800                                  struct snd_pcm_hw_params *params)
1801 {
1802         struct snd_soc_pcm_runtime *fe = substream->private_data;
1803         int ret, stream = substream->stream;
1804
1805         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
1806         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
1807
1808         memcpy(&fe->dpcm[substream->stream].hw_params, params,
1809                         sizeof(struct snd_pcm_hw_params));
1810         ret = dpcm_be_dai_hw_params(fe, substream->stream);
1811         if (ret < 0) {
1812                 dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
1813                 goto out;
1814         }
1815
1816         dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
1817                         fe->dai_link->name, params_rate(params),
1818                         params_channels(params), params_format(params));
1819
1820         /* call hw_params on the frontend */
1821         ret = soc_pcm_hw_params(substream, params);
1822         if (ret < 0) {
1823                 dev_err(fe->dev,"ASoC: hw_params FE failed %d\n", ret);
1824                 dpcm_be_dai_hw_free(fe, stream);
1825          } else
1826                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
1827
1828 out:
1829         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
1830         mutex_unlock(&fe->card->mutex);
1831         return ret;
1832 }
1833
1834 static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
1835                 struct snd_pcm_substream *substream, int cmd)
1836 {
1837         int ret;
1838
1839         dev_dbg(dpcm->be->dev, "ASoC: trigger BE %s cmd %d\n",
1840                         dpcm->fe->dai_link->name, cmd);
1841
1842         ret = soc_pcm_trigger(substream, cmd);
1843         if (ret < 0)
1844                 dev_err(dpcm->be->dev,"ASoC: trigger BE failed %d\n", ret);
1845
1846         return ret;
1847 }
1848
1849 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
1850                                int cmd)
1851 {
1852         struct snd_soc_dpcm *dpcm;
1853         int ret = 0;
1854
1855         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
1856
1857                 struct snd_soc_pcm_runtime *be = dpcm->be;
1858                 struct snd_pcm_substream *be_substream =
1859                         snd_soc_dpcm_get_substream(be, stream);
1860
1861                 /* is this op for this BE ? */
1862                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
1863                         continue;
1864
1865                 switch (cmd) {
1866                 case SNDRV_PCM_TRIGGER_START:
1867                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
1868                             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
1869                                 continue;
1870
1871                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1872                         if (ret)
1873                                 return ret;
1874
1875                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1876                         break;
1877                 case SNDRV_PCM_TRIGGER_RESUME:
1878                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
1879                                 continue;
1880
1881                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1882                         if (ret)
1883                                 return ret;
1884
1885                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1886                         break;
1887                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1888                         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
1889                                 continue;
1890
1891                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1892                         if (ret)
1893                                 return ret;
1894
1895                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
1896                         break;
1897                 case SNDRV_PCM_TRIGGER_STOP:
1898                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1899                                 continue;
1900
1901                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1902                                 continue;
1903
1904                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1905                         if (ret)
1906                                 return ret;
1907
1908                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
1909                         break;
1910                 case SNDRV_PCM_TRIGGER_SUSPEND:
1911                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1912                                 continue;
1913
1914                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1915                                 continue;
1916
1917                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1918                         if (ret)
1919                                 return ret;
1920
1921                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
1922                         break;
1923                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1924                         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
1925                                 continue;
1926
1927                         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
1928                                 continue;
1929
1930                         ret = dpcm_do_trigger(dpcm, be_substream, cmd);
1931                         if (ret)
1932                                 return ret;
1933
1934                         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
1935                         break;
1936                 }
1937         }
1938
1939         return ret;
1940 }
1941 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
1942
1943 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
1944 {
1945         struct snd_soc_pcm_runtime *fe = substream->private_data;
1946         int stream = substream->stream, ret;
1947         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1948
1949         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
1950
1951         switch (trigger) {
1952         case SND_SOC_DPCM_TRIGGER_PRE:
1953                 /* call trigger on the frontend before the backend. */
1954
1955                 dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
1956                                 fe->dai_link->name, cmd);
1957
1958                 ret = soc_pcm_trigger(substream, cmd);
1959                 if (ret < 0) {
1960                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1961                         goto out;
1962                 }
1963
1964                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1965                 break;
1966         case SND_SOC_DPCM_TRIGGER_POST:
1967                 /* call trigger on the frontend after the backend. */
1968
1969                 ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
1970                 if (ret < 0) {
1971                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1972                         goto out;
1973                 }
1974
1975                 dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
1976                                 fe->dai_link->name, cmd);
1977
1978                 ret = soc_pcm_trigger(substream, cmd);
1979                 break;
1980         case SND_SOC_DPCM_TRIGGER_BESPOKE:
1981                 /* bespoke trigger() - handles both FE and BEs */
1982
1983                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
1984                                 fe->dai_link->name, cmd);
1985
1986                 ret = soc_pcm_bespoke_trigger(substream, cmd);
1987                 if (ret < 0) {
1988                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
1989                         goto out;
1990                 }
1991                 break;
1992         default:
1993                 dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
1994                                 fe->dai_link->name);
1995                 ret = -EINVAL;
1996                 goto out;
1997         }
1998
1999         switch (cmd) {
2000         case SNDRV_PCM_TRIGGER_START:
2001         case SNDRV_PCM_TRIGGER_RESUME:
2002         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
2003                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
2004                 break;
2005         case SNDRV_PCM_TRIGGER_STOP:
2006         case SNDRV_PCM_TRIGGER_SUSPEND:
2007         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
2008                 fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
2009                 break;
2010         }
2011
2012 out:
2013         fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
2014         return ret;
2015 }
2016
2017 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
2018 {
2019         struct snd_soc_pcm_runtime *fe = substream->private_data;
2020         int stream = substream->stream;
2021
2022         /* if FE's runtime_update is already set, we're in race;
2023          * process this trigger later at exit
2024          */
2025         if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
2026                 fe->dpcm[stream].trigger_pending = cmd + 1;
2027                 return 0; /* delayed, assuming it's successful */
2028         }
2029
2030         /* we're alone, let's trigger */
2031         return dpcm_fe_dai_do_trigger(substream, cmd);
2032 }
2033
2034 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
2035 {
2036         struct snd_soc_dpcm *dpcm;
2037         int ret = 0;
2038
2039         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2040
2041                 struct snd_soc_pcm_runtime *be = dpcm->be;
2042                 struct snd_pcm_substream *be_substream =
2043                         snd_soc_dpcm_get_substream(be, stream);
2044
2045                 /* is this op for this BE ? */
2046                 if (!snd_soc_dpcm_be_can_update(fe, be, stream))
2047                         continue;
2048
2049                 if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
2050                     (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
2051                         continue;
2052
2053                 dev_dbg(be->dev, "ASoC: prepare BE %s\n",
2054                         dpcm->fe->dai_link->name);
2055
2056                 ret = soc_pcm_prepare(be_substream);
2057                 if (ret < 0) {
2058                         dev_err(be->dev, "ASoC: backend prepare failed %d\n",
2059                                 ret);
2060                         break;
2061                 }
2062
2063                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2064         }
2065         return ret;
2066 }
2067
2068 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
2069 {
2070         struct snd_soc_pcm_runtime *fe = substream->private_data;
2071         int stream = substream->stream, ret = 0;
2072
2073         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2074
2075         dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
2076
2077         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
2078
2079         /* there is no point preparing this FE if there are no BEs */
2080         if (list_empty(&fe->dpcm[stream].be_clients)) {
2081                 dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
2082                                 fe->dai_link->name);
2083                 ret = -EINVAL;
2084                 goto out;
2085         }
2086
2087         ret = dpcm_be_dai_prepare(fe, substream->stream);
2088         if (ret < 0)
2089                 goto out;
2090
2091         /* call prepare on the frontend */
2092         ret = soc_pcm_prepare(substream);
2093         if (ret < 0) {
2094                 dev_err(fe->dev,"ASoC: prepare FE %s failed\n",
2095                         fe->dai_link->name);
2096                 goto out;
2097         }
2098
2099         /* run the stream event for each BE */
2100         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
2101         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
2102
2103 out:
2104         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2105         mutex_unlock(&fe->card->mutex);
2106
2107         return ret;
2108 }
2109
2110 static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
2111                      unsigned int cmd, void *arg)
2112 {
2113         struct snd_soc_pcm_runtime *rtd = substream->private_data;
2114         struct snd_soc_platform *platform = rtd->platform;
2115
2116         if (platform->driver->ops && platform->driver->ops->ioctl)
2117                 return platform->driver->ops->ioctl(substream, cmd, arg);
2118         return snd_pcm_lib_ioctl(substream, cmd, arg);
2119 }
2120
2121 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
2122 {
2123         struct snd_pcm_substream *substream =
2124                 snd_soc_dpcm_get_substream(fe, stream);
2125         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2126         int err;
2127
2128         dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
2129                         stream ? "capture" : "playback", fe->dai_link->name);
2130
2131         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2132                 /* call bespoke trigger - FE takes care of all BE triggers */
2133                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
2134                                 fe->dai_link->name);
2135
2136                 err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
2137                 if (err < 0)
2138                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2139         } else {
2140                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
2141                         fe->dai_link->name);
2142
2143                 err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
2144                 if (err < 0)
2145                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err);
2146         }
2147
2148         err = dpcm_be_dai_hw_free(fe, stream);
2149         if (err < 0)
2150                 dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err);
2151
2152         err = dpcm_be_dai_shutdown(fe, stream);
2153         if (err < 0)
2154                 dev_err(fe->dev,"ASoC: shutdown FE failed %d\n", err);
2155
2156         /* run the stream event for each BE */
2157         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2158
2159         return 0;
2160 }
2161
2162 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
2163 {
2164         struct snd_pcm_substream *substream =
2165                 snd_soc_dpcm_get_substream(fe, stream);
2166         struct snd_soc_dpcm *dpcm;
2167         enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
2168         int ret;
2169
2170         dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
2171                         stream ? "capture" : "playback", fe->dai_link->name);
2172
2173         /* Only start the BE if the FE is ready */
2174         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
2175                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
2176                 return -EINVAL;
2177
2178         /* startup must always be called for new BEs */
2179         ret = dpcm_be_dai_startup(fe, stream);
2180         if (ret < 0)
2181                 goto disconnect;
2182
2183         /* keep going if FE state is > open */
2184         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
2185                 return 0;
2186
2187         ret = dpcm_be_dai_hw_params(fe, stream);
2188         if (ret < 0)
2189                 goto close;
2190
2191         /* keep going if FE state is > hw_params */
2192         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
2193                 return 0;
2194
2195
2196         ret = dpcm_be_dai_prepare(fe, stream);
2197         if (ret < 0)
2198                 goto hw_free;
2199
2200         /* run the stream event for each BE */
2201         dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
2202
2203         /* keep going if FE state is > prepare */
2204         if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
2205                 fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
2206                 return 0;
2207
2208         if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
2209                 /* call trigger on the frontend - FE takes care of all BE triggers */
2210                 dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
2211                                 fe->dai_link->name);
2212
2213                 ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
2214                 if (ret < 0) {
2215                         dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret);
2216                         goto hw_free;
2217                 }
2218         } else {
2219                 dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
2220                         fe->dai_link->name);
2221
2222                 ret = dpcm_be_dai_trigger(fe, stream,
2223                                         SNDRV_PCM_TRIGGER_START);
2224                 if (ret < 0) {
2225                         dev_err(fe->dev,"ASoC: trigger FE failed %d\n", ret);
2226                         goto hw_free;
2227                 }
2228         }
2229
2230         return 0;
2231
2232 hw_free:
2233         dpcm_be_dai_hw_free(fe, stream);
2234 close:
2235         dpcm_be_dai_shutdown(fe, stream);
2236 disconnect:
2237         /* disconnect any non started BEs */
2238         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2239                 struct snd_soc_pcm_runtime *be = dpcm->be;
2240                 if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
2241                                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2242         }
2243
2244         return ret;
2245 }
2246
2247 static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
2248 {
2249         int ret;
2250
2251         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2252         ret = dpcm_run_update_startup(fe, stream);
2253         if (ret < 0)
2254                 dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
2255         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2256
2257         return ret;
2258 }
2259
2260 static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
2261 {
2262         int ret;
2263
2264         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
2265         ret = dpcm_run_update_shutdown(fe, stream);
2266         if (ret < 0)
2267                 dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
2268         dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
2269
2270         return ret;
2271 }
2272
2273 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
2274  * any DAI links.
2275  */
2276 int soc_dpcm_runtime_update(struct snd_soc_card *card)
2277 {
2278         int i, old, new, paths;
2279
2280         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2281         for (i = 0; i < card->num_rtd; i++) {
2282                 struct snd_soc_dapm_widget_list *list;
2283                 struct snd_soc_pcm_runtime *fe = &card->rtd[i];
2284
2285                 /* make sure link is FE */
2286                 if (!fe->dai_link->dynamic)
2287                         continue;
2288
2289                 /* only check active links */
2290                 if (!fe->cpu_dai->active)
2291                         continue;
2292
2293                 /* DAPM sync will call this to update DSP paths */
2294                 dev_dbg(fe->dev, "ASoC: DPCM runtime update for FE %s\n",
2295                         fe->dai_link->name);
2296
2297                 /* skip if FE doesn't have playback capability */
2298                 if (!fe->cpu_dai->driver->playback.channels_min
2299                     || !fe->codec_dai->driver->playback.channels_min)
2300                         goto capture;
2301
2302                 /* skip if FE isn't currently playing */
2303                 if (!fe->cpu_dai->playback_active
2304                     || !fe->codec_dai->playback_active)
2305                         goto capture;
2306
2307                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
2308                 if (paths < 0) {
2309                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2310                                         fe->dai_link->name,  "playback");
2311                         mutex_unlock(&card->mutex);
2312                         return paths;
2313                 }
2314
2315                 /* update any new playback paths */
2316                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
2317                 if (new) {
2318                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2319                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2320                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2321                 }
2322
2323                 /* update any old playback paths */
2324                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
2325                 if (old) {
2326                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
2327                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
2328                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
2329                 }
2330
2331                 dpcm_path_put(&list);
2332 capture:
2333                 /* skip if FE doesn't have capture capability */
2334                 if (!fe->cpu_dai->driver->capture.channels_min
2335                     || !fe->codec_dai->driver->capture.channels_min)
2336                         continue;
2337
2338                 /* skip if FE isn't currently capturing */
2339                 if (!fe->cpu_dai->capture_active
2340                     || !fe->codec_dai->capture_active)
2341                         continue;
2342
2343                 paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
2344                 if (paths < 0) {
2345                         dev_warn(fe->dev, "ASoC: %s no valid %s path\n",
2346                                         fe->dai_link->name,  "capture");
2347                         mutex_unlock(&card->mutex);
2348                         return paths;
2349                 }
2350
2351                 /* update any new capture paths */
2352                 new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
2353                 if (new) {
2354                         dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2355                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2356                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2357                 }
2358
2359                 /* update any old capture paths */
2360                 old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
2361                 if (old) {
2362                         dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
2363                         dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
2364                         dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
2365                 }
2366
2367                 dpcm_path_put(&list);
2368         }
2369
2370         mutex_unlock(&card->mutex);
2371         return 0;
2372 }
2373 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
2374 {
2375         struct snd_soc_dpcm *dpcm;
2376         struct list_head *clients =
2377                 &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
2378
2379         list_for_each_entry(dpcm, clients, list_be) {
2380
2381                 struct snd_soc_pcm_runtime *be = dpcm->be;
2382                 int i;
2383
2384                 if (be->dai_link->ignore_suspend)
2385                         continue;
2386
2387                 for (i = 0; i < be->num_codecs; i++) {
2388                         struct snd_soc_dai *dai = be->codec_dais[i];
2389                         struct snd_soc_dai_driver *drv = dai->driver;
2390
2391                         dev_dbg(be->dev, "ASoC: BE digital mute %s\n",
2392                                          be->dai_link->name);
2393
2394                         if (drv->ops && drv->ops->digital_mute &&
2395                                                         dai->playback_active)
2396                                 drv->ops->digital_mute(dai, mute);
2397                 }
2398         }
2399
2400         return 0;
2401 }
2402
2403 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
2404 {
2405         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2406         struct snd_soc_dpcm *dpcm;
2407         struct snd_soc_dapm_widget_list *list;
2408         int ret;
2409         int stream = fe_substream->stream;
2410
2411         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2412         fe->dpcm[stream].runtime = fe_substream->runtime;
2413
2414         ret = dpcm_path_get(fe, stream, &list);
2415         if (ret < 0) {
2416                 mutex_unlock(&fe->card->mutex);
2417                 return ret;
2418         } else if (ret == 0) {
2419                 dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
2420                         fe->dai_link->name, stream ? "capture" : "playback");
2421         }
2422
2423         /* calculate valid and active FE <-> BE dpcms */
2424         dpcm_process_paths(fe, stream, &list, 1);
2425
2426         ret = dpcm_fe_dai_startup(fe_substream);
2427         if (ret < 0) {
2428                 /* clean up all links */
2429                 list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2430                         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2431
2432                 dpcm_be_disconnect(fe, stream);
2433                 fe->dpcm[stream].runtime = NULL;
2434         }
2435
2436         dpcm_clear_pending_state(fe, stream);
2437         dpcm_path_put(&list);
2438         mutex_unlock(&fe->card->mutex);
2439         return ret;
2440 }
2441
2442 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
2443 {
2444         struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
2445         struct snd_soc_dpcm *dpcm;
2446         int stream = fe_substream->stream, ret;
2447
2448         mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
2449         ret = dpcm_fe_dai_shutdown(fe_substream);
2450
2451         /* mark FE's links ready to prune */
2452         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
2453                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
2454
2455         dpcm_be_disconnect(fe, stream);
2456
2457         fe->dpcm[stream].runtime = NULL;
2458         mutex_unlock(&fe->card->mutex);
2459         return ret;
2460 }
2461
2462 /* create a new pcm */
2463 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
2464 {
2465         struct snd_soc_platform *platform = rtd->platform;
2466         struct snd_soc_dai *codec_dai;
2467         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
2468         struct snd_pcm *pcm;
2469         char new_name[64];
2470         int ret = 0, playback = 0, capture = 0;
2471         int i;
2472
2473         if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
2474                 playback = rtd->dai_link->dpcm_playback;
2475                 capture = rtd->dai_link->dpcm_capture;
2476         } else {
2477                 for (i = 0; i < rtd->num_codecs; i++) {
2478                         codec_dai = rtd->codec_dais[i];
2479                         if (codec_dai->driver->playback.channels_min)
2480                                 playback = 1;
2481                         if (codec_dai->driver->capture.channels_min)
2482                                 capture = 1;
2483                 }
2484
2485                 capture = capture && cpu_dai->driver->capture.channels_min;
2486                 playback = playback && cpu_dai->driver->playback.channels_min;
2487         }
2488
2489         if (rtd->dai_link->playback_only) {
2490                 playback = 1;
2491                 capture = 0;
2492         }
2493
2494         if (rtd->dai_link->capture_only) {
2495                 playback = 0;
2496                 capture = 1;
2497         }
2498
2499         /* create the PCM */
2500         if (rtd->dai_link->no_pcm) {
2501                 snprintf(new_name, sizeof(new_name), "(%s)",
2502                         rtd->dai_link->stream_name);
2503
2504                 ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
2505                                 playback, capture, &pcm);
2506         } else {
2507                 if (rtd->dai_link->dynamic)
2508                         snprintf(new_name, sizeof(new_name), "%s (*)",
2509                                 rtd->dai_link->stream_name);
2510                 else
2511                         snprintf(new_name, sizeof(new_name), "%s %s-%d",
2512                                 rtd->dai_link->stream_name,
2513                                 (rtd->num_codecs > 1) ?
2514                                 "multicodec" : rtd->codec_dai->name, num);
2515
2516                 ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
2517                         capture, &pcm);
2518         }
2519         if (ret < 0) {
2520                 dev_err(rtd->card->dev, "ASoC: can't create pcm for %s\n",
2521                         rtd->dai_link->name);
2522                 return ret;
2523         }
2524         dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
2525
2526         /* DAPM dai link stream work */
2527         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
2528
2529         rtd->pcm = pcm;
2530         pcm->private_data = rtd;
2531
2532         if (rtd->dai_link->no_pcm) {
2533                 if (playback)
2534                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
2535                 if (capture)
2536                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
2537                 goto out;
2538         }
2539
2540         /* ASoC PCM operations */
2541         if (rtd->dai_link->dynamic) {
2542                 rtd->ops.open           = dpcm_fe_dai_open;
2543                 rtd->ops.hw_params      = dpcm_fe_dai_hw_params;
2544                 rtd->ops.prepare        = dpcm_fe_dai_prepare;
2545                 rtd->ops.trigger        = dpcm_fe_dai_trigger;
2546                 rtd->ops.hw_free        = dpcm_fe_dai_hw_free;
2547                 rtd->ops.close          = dpcm_fe_dai_close;
2548                 rtd->ops.pointer        = soc_pcm_pointer;
2549                 rtd->ops.ioctl          = soc_pcm_ioctl;
2550         } else {
2551                 rtd->ops.open           = soc_pcm_open;
2552                 rtd->ops.hw_params      = soc_pcm_hw_params;
2553                 rtd->ops.prepare        = soc_pcm_prepare;
2554                 rtd->ops.trigger        = soc_pcm_trigger;
2555                 rtd->ops.hw_free        = soc_pcm_hw_free;
2556                 rtd->ops.close          = soc_pcm_close;
2557                 rtd->ops.pointer        = soc_pcm_pointer;
2558                 rtd->ops.ioctl          = soc_pcm_ioctl;
2559         }
2560
2561         if (platform->driver->ops) {
2562                 rtd->ops.ack            = platform->driver->ops->ack;
2563                 rtd->ops.copy           = platform->driver->ops->copy;
2564                 rtd->ops.silence        = platform->driver->ops->silence;
2565                 rtd->ops.page           = platform->driver->ops->page;
2566                 rtd->ops.mmap           = platform->driver->ops->mmap;
2567         }
2568
2569         if (playback)
2570                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2571
2572         if (capture)
2573                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2574
2575         if (platform->driver->pcm_new) {
2576                 ret = platform->driver->pcm_new(rtd);
2577                 if (ret < 0) {
2578                         dev_err(platform->dev,
2579                                 "ASoC: pcm constructor failed: %d\n",
2580                                 ret);
2581                         return ret;
2582                 }
2583         }
2584
2585         pcm->private_free = platform->driver->pcm_free;
2586 out:
2587         dev_info(rtd->card->dev, "%s <-> %s mapping ok\n",
2588                  (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,
2589                  cpu_dai->name);
2590         return ret;
2591 }
2592
2593 /* is the current PCM operation for this FE ? */
2594 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
2595 {
2596         if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
2597                 return 1;
2598         return 0;
2599 }
2600 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
2601
2602 /* is the current PCM operation for this BE ? */
2603 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
2604                 struct snd_soc_pcm_runtime *be, int stream)
2605 {
2606         if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
2607            ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
2608                   be->dpcm[stream].runtime_update))
2609                 return 1;
2610         return 0;
2611 }
2612 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
2613
2614 /* get the substream for this BE */
2615 struct snd_pcm_substream *
2616         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
2617 {
2618         return be->pcm->streams[stream].substream;
2619 }
2620 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
2621
2622 /* get the BE runtime state */
2623 enum snd_soc_dpcm_state
2624         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
2625 {
2626         return be->dpcm[stream].state;
2627 }
2628 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
2629
2630 /* set the BE runtime state */
2631 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
2632                 int stream, enum snd_soc_dpcm_state state)
2633 {
2634         be->dpcm[stream].state = state;
2635 }
2636 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
2637
2638 /*
2639  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
2640  * are not running, paused or suspended for the specified stream direction.
2641  */
2642 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
2643                 struct snd_soc_pcm_runtime *be, int stream)
2644 {
2645         struct snd_soc_dpcm *dpcm;
2646         int state;
2647
2648         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2649
2650                 if (dpcm->fe == fe)
2651                         continue;
2652
2653                 state = dpcm->fe->dpcm[stream].state;
2654                 if (state == SND_SOC_DPCM_STATE_START ||
2655                         state == SND_SOC_DPCM_STATE_PAUSED ||
2656                         state == SND_SOC_DPCM_STATE_SUSPEND)
2657                         return 0;
2658         }
2659
2660         /* it's safe to free/stop this BE DAI */
2661         return 1;
2662 }
2663 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
2664
2665 /*
2666  * We can only change hw params a BE DAI if any of it's FE are not prepared,
2667  * running, paused or suspended for the specified stream direction.
2668  */
2669 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
2670                 struct snd_soc_pcm_runtime *be, int stream)
2671 {
2672         struct snd_soc_dpcm *dpcm;
2673         int state;
2674
2675         list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
2676
2677                 if (dpcm->fe == fe)
2678                         continue;
2679
2680                 state = dpcm->fe->dpcm[stream].state;
2681                 if (state == SND_SOC_DPCM_STATE_START ||
2682                         state == SND_SOC_DPCM_STATE_PAUSED ||
2683                         state == SND_SOC_DPCM_STATE_SUSPEND ||
2684                         state == SND_SOC_DPCM_STATE_PREPARE)
2685                         return 0;
2686         }
2687
2688         /* it's safe to change hw_params */
2689         return 1;
2690 }
2691 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2692
2693 int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
2694                 int cmd, struct snd_soc_platform *platform)
2695 {
2696         if (platform->driver->ops && platform->driver->ops->trigger)
2697                 return platform->driver->ops->trigger(substream, cmd);
2698         return 0;
2699 }
2700 EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
2701
2702 #ifdef CONFIG_DEBUG_FS
2703 static char *dpcm_state_string(enum snd_soc_dpcm_state state)
2704 {
2705         switch (state) {
2706         case SND_SOC_DPCM_STATE_NEW:
2707                 return "new";
2708         case SND_SOC_DPCM_STATE_OPEN:
2709                 return "open";
2710         case SND_SOC_DPCM_STATE_HW_PARAMS:
2711                 return "hw_params";
2712         case SND_SOC_DPCM_STATE_PREPARE:
2713                 return "prepare";
2714         case SND_SOC_DPCM_STATE_START:
2715                 return "start";
2716         case SND_SOC_DPCM_STATE_STOP:
2717                 return "stop";
2718         case SND_SOC_DPCM_STATE_SUSPEND:
2719                 return "suspend";
2720         case SND_SOC_DPCM_STATE_PAUSED:
2721                 return "paused";
2722         case SND_SOC_DPCM_STATE_HW_FREE:
2723                 return "hw_free";
2724         case SND_SOC_DPCM_STATE_CLOSE:
2725                 return "close";
2726         }
2727
2728         return "unknown";
2729 }
2730
2731 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
2732                                 int stream, char *buf, size_t size)
2733 {
2734         struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
2735         struct snd_soc_dpcm *dpcm;
2736         ssize_t offset = 0;
2737
2738         /* FE state */
2739         offset += snprintf(buf + offset, size - offset,
2740                         "[%s - %s]\n", fe->dai_link->name,
2741                         stream ? "Capture" : "Playback");
2742
2743         offset += snprintf(buf + offset, size - offset, "State: %s\n",
2744                         dpcm_state_string(fe->dpcm[stream].state));
2745
2746         if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2747             (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2748                 offset += snprintf(buf + offset, size - offset,
2749                                 "Hardware Params: "
2750                                 "Format = %s, Channels = %d, Rate = %d\n",
2751                                 snd_pcm_format_name(params_format(params)),
2752                                 params_channels(params),
2753                                 params_rate(params));
2754
2755         /* BEs state */
2756         offset += snprintf(buf + offset, size - offset, "Backends:\n");
2757
2758         if (list_empty(&fe->dpcm[stream].be_clients)) {
2759                 offset += snprintf(buf + offset, size - offset,
2760                                 " No active DSP links\n");
2761                 goto out;
2762         }
2763
2764         list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
2765                 struct snd_soc_pcm_runtime *be = dpcm->be;
2766                 params = &dpcm->hw_params;
2767
2768                 offset += snprintf(buf + offset, size - offset,
2769                                 "- %s\n", be->dai_link->name);
2770
2771                 offset += snprintf(buf + offset, size - offset,
2772                                 "   State: %s\n",
2773                                 dpcm_state_string(be->dpcm[stream].state));
2774
2775                 if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
2776                     (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
2777                         offset += snprintf(buf + offset, size - offset,
2778                                 "   Hardware Params: "
2779                                 "Format = %s, Channels = %d, Rate = %d\n",
2780                                 snd_pcm_format_name(params_format(params)),
2781                                 params_channels(params),
2782                                 params_rate(params));
2783         }
2784
2785 out:
2786         return offset;
2787 }
2788
2789 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
2790                                 size_t count, loff_t *ppos)
2791 {
2792         struct snd_soc_pcm_runtime *fe = file->private_data;
2793         ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
2794         char *buf;
2795
2796         buf = kmalloc(out_count, GFP_KERNEL);
2797         if (!buf)
2798                 return -ENOMEM;
2799
2800         if (fe->cpu_dai->driver->playback.channels_min)
2801                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
2802                                         buf + offset, out_count - offset);
2803
2804         if (fe->cpu_dai->driver->capture.channels_min)
2805                 offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
2806                                         buf + offset, out_count - offset);
2807
2808         ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
2809
2810         kfree(buf);
2811         return ret;
2812 }
2813
2814 static const struct file_operations dpcm_state_fops = {
2815         .open = simple_open,
2816         .read = dpcm_state_read_file,
2817         .llseek = default_llseek,
2818 };
2819
2820 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
2821 {
2822         if (!rtd->dai_link)
2823                 return 0;
2824
2825         rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
2826                         rtd->card->debugfs_card_root);
2827         if (!rtd->debugfs_dpcm_root) {
2828                 dev_dbg(rtd->dev,
2829                          "ASoC: Failed to create dpcm debugfs directory %s\n",
2830                          rtd->dai_link->name);
2831                 return -EINVAL;
2832         }
2833
2834         rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
2835                                                 rtd->debugfs_dpcm_root,
2836                                                 rtd, &dpcm_state_fops);
2837
2838         return 0;
2839 }
2840 #endif